[libcxx] [test] Rename _Up to U, etc. NFCI.

This improves readability and (theoretically) improves portability,
as _Ugly names are reserved.

This performs additional de-uglification, so all of these tests
follow the example of iterator.traits/empty.pass.cpp.

llvm-svn: 310761

1 files changed, 2 insertions, 2 deletions

diff --git a/libcxx/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp b/libcxx/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
index 57d4a3834a0..179e5e762a9 100644
--- a/libcxx/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
+++ b/libcxx/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
@@ -25,8 +25,8 @@ struct has_value_type
 {
 private:
     struct two {char lx; char lxx;};
-    template <class _Up> static two test(...);
-    template <class _Up> static char test(typename _Up::value_type* = 0);
+    template <class U> static two test(...);
+    template <class U> static char test(typename U::value_type* = 0);
 public:
     static const bool value = sizeof(test<T>(0)) == 1;
 };